We note the disadvantages which many people with disabilities have regarding learning and using mathematics. We then describe work in progress on developing intelligent systems to assist such people by allowing them to dictate mathematical expressions in relatively natural language into either a system which can interpret and display the expressions in a document or web page, or a web-based calculator, including the possibilities of feedback in both visible and other modes (e.g. synthesized speech and Braille). We discuss the implementation and use of these systems, initial results of a study to evaluate their utility, and potential further developments.